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Simplifying
7u2 + 28 = 84
Reorder the terms:
28 + 7u2 = 84
Solving
28 + 7u2 = 84
Solving for variable 'u'.
Move all terms containing u to the left, all other terms to the right.
Add '-28' to each side of the equation.
28 + -28 + 7u2 = 84 + -28
Combine like terms: 28 + -28 = 0
0 + 7u2 = 84 + -28
7u2 = 84 + -28
Combine like terms: 84 + -28 = 56
7u2 = 56
Divide each side by '7'.
u2 = 8
Simplifying
u2 = 8
Take the square root of each side:
u = {-2.828427125, 2.828427125}
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